A video I found the other day.
I know these cars have a really low reputation in Australia, with only one or two people who like them on the whole continent. But the ones in this video have the larger 1.6 liter, DOHC, 16 valve, EFI engine, which is quite a bit more powerful than the SOHC 1.5 liter carburetted RB Gemini.
This is part of a Best Motoring video magazine review of the Gemini. They liked to run the Lotus and Irmscher models against each other on the track, which is the content of this little video.. This one ended up closer than the later model comparison. In general, the Irmscher model would have a stiffer front suspension, less body roll, less comfortable ride, possibly a close ratio steering rack, and they have a little understeer. The Lotus model would have soft springs and stiff dampers, more body roll, and stiffer rear suspension to induce some neutral to mild oversteer handling.
It's 1:26 long, it won;t be too much torture even if you still hate RB Geminis after watching it.
http://www.youtube.com/watch?v=Z3llFstKAUY